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arXiv · 2603.12723

Torsional oscillation of carbon nanotubes driven by electron spins

Koji Yamada·Wataru Izumida·Mamoru Matsuo·Takeo Kato
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Abstract

We theoretically investigate the current-induced excitation of torsional vibrations in a suspended carbon nanotube (CNT) quantum dot. By considering a CNT clamped between half-metallic ferromagnetic electrodes with an antiparallel magnetization configuration, we demonstrate that the spin-rotation coupling enables the transfer of angular momentum from electron spins to the mechanical torsional mode under a constant source-drain voltage. Using a master-equation approach to analyze the coupled dynamics of the dot levels and a quantized torsional oscillator, we evaluate the steady-state current and phonon distribution. We find that when the Zeeman splitting matches the torsional phonon energy, the system exhibits a sharp resonant behavior in the current, accompanied by a significant increase in the phonon population. Our estimates for realistic device parameters indicate that this spin-driven mechanism can drive CNT torsional vibrations with detectable amplitudes. This work provides a theoretical basis for current-controlled actuation of nanoelectromechanical systems via the spin angular momentum of electrons.

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Koji Yamada, Wataru Izumida, Mamoru Matsuo, Takeo Kato. 2026-03-13. Torsional oscillation of carbon nanotubes driven by electron spins. https://arxiv.org/abs/2603.12723

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